Step 1: Concept Overview:
C\(_4\) photosynthesis, also known as the Hatch-Slack pathway, is an adaptation in plants living in hot, arid environments. It concentrates CO\(_2\) to minimize photorespiration. We need to identify the incorrect statement about this process.
Step 2: Detailed Analysis:
Let's examine each statement:
(A) Kranz anatomy is present: Correct. C\(_4\) plants possess Kranz anatomy, a specialized leaf structure. Bundle sheath cells containing photosynthetic machinery surround the vascular bundles, and mesophyll cells encircle the bundle sheath cells.
(B) Initial CO\(_2\) acceptor is Phosphoenol-pyruvate (PEP): Correct. In mesophyll cells, the enzyme PEP carboxylase fixes CO\(_2\) using PEP, a 3-carbon molecule.
(C) First stable product is 3-phosphoglycerate: Incorrect. PEP carboxylase's initial CO\(_2\) fixation product is oxaloacetate, a 4-carbon acid (hence C\(_4\) plants). 3-phosphoglycerate (a 3-carbon compound) is the first stable product in the Calvin cycle (C\(_3\) pathway).
(D) Calvin cycle operates along with the Hatch and Slack cycle: Correct. The C\(_4\) cycle captures CO\(_2\) in mesophyll cells and transports it as a 4-carbon acid to bundle sheath cells. There, CO\(_2\) is released and refixed by RuBisCO within the Calvin cycle.
Step 3: Conclusion:
The statement claiming 3-phosphoglycerate as the first stable product is incorrect. This holds true for C\(_3\) plants, not C\(_4\) plants.